Process of watermarking paper and adjunct therefor



March 2 1926.

A. ALLEN PROCESS OF WATERMARKING PAPER AND ADJUNCT THEREFOR Filed NOV. 20, 1925 {M A r A X \M 4 4)?! Patented Mar. 2, 1926.

UNITED-STATES 1,575,513 PATENT OFFICE.

ALBERT ALLEN, FANGOR, MAINE, ASSIGNOR TO EASTERN MANUFACTURING COM- IPANY, OF BOSTON, MASSACEUSETTS, ACORPORATION OF MASSACHUSETTS.

rnocnss or warnnimnxine PAPER AND mmune: THEREFOR.

Application filed November 20, 1925. seriallio. 70,264.

To all whom it may concern:

citizen of the United States, residing at Bangor, in the county of Penobscot and State of Maine, have invented new and useful Improvements in Processes of Watermarking Paper and Adjunct Therefor, of which the following is-a specification.

This invention has relation to watermarking bands for mounting on cylinders or rolls, or other similar watermarking contrivances which are employed for impressing marks on a webof paper during the course of its manufacture, and has-for its object to provide an adjunct for such devices whereby a pleasingly blurred or indistinct water mark may be produced on the paper, closely simulating'the old-fashioned water mark obtained by the use of a dandy roll in connection with a relatively slow rate of paper formation.

Where a dandy roll is employed, it is caused to ride on the web while it is on the Fourdrinier wire'and still contains a very large water content. The general use ofa dandy roll for effective watermarking is, however, limited because of the largely different speeds at which various paper-making machines are run, since in machines where high paper-making speed is employed, the desirable indistinctness of the-mark is accentuated to an unpleasant blur.

In application, Serial No. 8,671, filed jointly Feb. 12, 1925, by Stuart W. Webb and Hugo H. Hanson, there has been disclosed and claimed a method of producing a pleasantly indistinct watermark closely resembling that produced by a dandy roll atlow speed, and which may successfully be applied to paper-makin machines run at relatively high speeds, watermarking device at, a definite position in the course of the manufacture of the paper, this. position being after leaving the Fourdrinier wire and before it reaches the press rolls.

1 have ing band or equivalent device is covered with a smooth, thin protecting web of suitable material, which may for convenience of designation be termed a membrane, during the impression of the mark, articularly when this band is so located as in the hereinbefore described application for patent, an indistinct watermark which more closely y locating the discovered that if the watermarkresembles an old fashioned watermark is produced. F a

On the accompanying drawings, Figure 1 represents in detailed perspective a watermar'kingband, which may be applied to a roll or cylinder and which is fitted with a membrane, partly cut away to show the marks on the band.

- Figure 2- is a similar view, showing the web or membrane which is employed for coverin the watermarking band, partly broken into. 1

' Figure 3 represents a detailed section through a marking'portion of the band shown in Figure 1, with the membrane lying thereover.

Referring to the drawings, 1 as a whole represents a watermarking band which is adapted to be mounted on a roll or cylinder. The band, which is preferably made of substantially impervious material as rubber, has

raised marking'elements 2 thereon, which,

are to be impressed on the web of paper to form the watermark. The band is provided with a smooth and thin flexible. covering 3,

which entirely coversor overlies the marking shown in Figure 2, of somewhat less diameter than the external diameter of watermarking band in connection with which it is to be used. In applyingit to the band 1, it is stretched thereover and the thin rubber sheeting assumes somewhat the contour or outline of the marking elements.

In impressing the watermark with the roll on the web of paper, the thin, smooth sheet of covering material 3 acts to round or smooth off the sharp edges of the marking elements, and thus to prevent a sharp, well-defined watermark from being. impressed, producing, instead, an indlstinct watermark characterized by its indefinite edge lines, which merge into the main body of the paper. Any other suitable protecting thin elastic membrane or film may be employed for the band, which, particularly when located in the position described in the application referred to, has been found to effect.

4 band produce excellent-results. This invention, while especially contemplating the use of the watermarking device in the advantageous position described, is not intended to be limited in its broadest aspects to any particular locationthereof.

I am well aware of the fact that it has been proposed to cover the watermarking devices with fabrics to produce a fabric finish on the paper, but in the present instance, it is not desired to produce such an Having thus described this invention, it should be obvious that changes or modificationsmight be resorted to without departin from the spirit or scope thereof as define by the appended claims.

I claim:

1. The combination with a watermarking device having marking elements, of a smooth membrane covering the marking elements on said device.

2. The combination with a watermarking adapted to be mounted on a cylinder or roll, of a membrane covering the marking portion of said band.

3. The combination with a watermarking device, of a smooth sheeting of thin rubber covering the marking portion of said device.

4.. The combination with a watermarking device, of a smooth sheeting of thin rubber,

a proximating 5/1000 to 10/1000 of an inch,

t lckness, stretched over and covering the marking portion of said device.

5. The combination with a watermarking device, of a smooth sheeting of thinsubstam tially impervious material covering the marking portion of said device and assuming somewhat the. contour thereof.

6. A process of watermarking paper in the course of its manufacture, which comprises interposing a smooth membrane between the marking device and the web of unfinished paper on which the mark is to be impressed.

7. A process of watermarking paper in the course of its manufacture, WhlOh comprises interposing a smooth sheeting of thin rubber between the marking device and the web of unfinished paper on which the mark is to be impressed.

8. A process of watermarking paper in the course of its manufacture on a Fourdrinier paper-making machine, which consists in subjecting the paper web to a watermarking device having a smooth membrane covering the marking portion of said device, and impressing the mark on the web after it has left the Fourdrinier wire and before it reaches the press rolls.

9. A process of watermarking paper in the course of its manufacture on a Fourdrinier paper-making machine, which consists in subjecting the paper web to a watermarking band provided with a smooth sheeting of thin rubber stretched over and covering the marking portion of said band, and impressing the'mark on the paper after it has left the Fourdrinier wire and before it reaches the press rolls.

10. The combination with a watermarking device made of rubber, of a smooth membrane covering the marking portion of said device.

In testimony whereof I have aflixed my signature.

ALBERT ALLEN. 

